Our resident web legend Iain has coded up a HEXUS search plugin for Firefox, allowing you to choose to search HEXUS from the search bar in the top right of Firefox.
To install the plugin, first download it, then copy the contents of the downloaded zip file into the "searchplugins" folder within your Firefox installation (typically C:\program files\Mozilla Firefox\searchplugins).
You must then close all Firefox windows and restart the program for the new plugin to be detected. Now you can select HEXUS as the search target by clicking the logo in the top-right search minibar. It'll be listed along with the likes of Google, Amazon and any other search plugins you may have installed.
Enjoy!